RE: [RFC] ACPI, APEI, Generic Hardware Error Source POLL/IRQ/NMInotification type support

[Luck, Tony]

>Because the memory area used to transfer hardware error information
>from BIOS to Linux can be determined only in NMI, IRQ or timer
>handler, but general ioremap can not be used in atomic context, so a
>special version of atomic ioremap is implemented for that.
>
>Known issue:
>
>- Error information can not be printed for recoverable errors notified
>  via NMI, because printk is not NMI-safe. Will fix this via delay
>  printing to IRQ context via irq_work or make printk NMI-safe.

Would it be possible to defer the "ioremap" to a work queue too? Then
we wouldn't need the special versions of ioremap.

-Tony
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